The collision involved two passenger vehicles at the 15200 block of Ash Way, Snohomish County Sheriff's Office spokeswoman Shari Ireton said.
The accident was reported at around 3:10 p.m. Friday.
Six people were taken to hospitals, Snohomish County Fire District 1 reported.
One of the drivers was unconscious when firefighters arrived, District 1 spokeswoman Leslie Hynes said. He was transported by paramedics to Harborview Medical Center in Seattle. His passengers, a woman and a man in their 40s, were transported by firefighters to Providence Regional Medical Center Everett.
The driver of the other car was also seriously injured. She was taken by paramedics to Harborview. Her daughters, a toddler and a 13-year-old, had minor injuries and were also transported to Harborview Medical Center.
Ash Way was closed at 156th Avenue and transit buses were rerouted until further notice.
More Local News Headlines
It's not easy to keep exotic animals as pets and many fall victim to their own popularity or become pests in an alien environment I-1366 forces state’s hand Details out on proposed vaping ban 6 vie for 3 seats on Snohomish City Council Granite Falls to choose between mayor, city manager Tim Eyman stays mum on probe 1 arrested in Bellevue for Sept. assault, burglary in Monroe Six seek three contested seats on Everett City Council
Our new comment system is not supported in IE 7. Please upgrade your browser here.